Mobrey Vertical Magnetic Level Switches - Pan- · PDF fileSeptember 2012 Mobrey Vertical Level...

Product Data SheetIP107, Rev BBSeptember 2012 Mobrey Vertical Level Switches

www.emersonprocess.com

• Unique 3 magnet latching switch mechanism

• No springs in switch mechanism

• Weatherproof

• Flameproof

• Direct mount

• Chamber mount

UL

Contents

Overview of Mobrey Vertical Magnetic Level Switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 2

Direct Mount: Vertical Displacer-type Level Switch Ordering Information . . . . . . . . . . . . . . page 4

Direct Mount: Vertical Float-type Level Switch Ordering Information . . . . . . . . . . . . . . . . . page 6

Carbon Steel Chamber with Mounted Float-type Level Switch Ordering Information . . . . . page 8

Stainless Steel Chamber with Mounted Float-type Level Switch Ordering Information. . . page 10

Technical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 12

Dimensional Drawings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 17

Mobrey Vertical Magnetic Level Switches

Product Data SheetIP107, Rev BB

September 2012Mobrey Vertical Level Switches

2

Overview of Mobrey Vertical Magnetic Level Switches

INTRODUCTION

Whether you require a switch for critical area applications or just general purpose control, the extensive range of Mobrey switches ensures that we will always have a solution to your particular problem.

A choice of displacer-type or float-type operated level switch is available to order for direct vertical mounting (no chamber).See Table 1 on page 4 or Table 2 on page 6 for ordering information.

These level switches can be optionally supplied mounted vertically in chambers, in a sealed or removable form.

A range of carbon steel chambers is available, or for more vigorous applications there are 316 stainless steel chambers.See Table 3 on page 8 or Table 4 on page 10 for ordering information.

There are a variety of tank and process connection options available to make installation simple and economic. This gives you the choice to meet your application in keeping with your budget.

Quality and ReliabilityMobrey vertical magnetic level switches for industrial and process control use have been available for over 20 years and have gained a reputation for quality and reliability.

Based on the industry-standard boiler water level controls, these controls use the same three-magnet switch mechanism for snap-action latching and switching. The design of this unique switch mechanism overcomes all the inherent problems of mercury tubes and micro switches. Even under severe vibration conditions, there are no springs to cause contact bounce, hover, or even failure. The snap-action magnets give a positive and stable latching, time after time after time.

Choice of Switching MechanismsThere are two switching functions available: 2 x SPST (SPCO) or DPDT (DPCO) switching, and each comes in four variants:

• General purpose use with silver cadmium oxide contacts for long life

• Low power circuit with gold-plated contacts for use in low current/voltage applications such as I.S. circuits

• High power circuits giving up to 10 Amps switching capability

• Hermetically sealed for the ultimate in reliability – sealed for life

Operation in Extreme ConditionsWhen controls are required to operate in extreme conditions, the unique Mobrey hermetically sealed switch provides dependable life long operation that you can rely on. With all its moving parts and contacts completely enclosed, this genuine hermetically sealed switch is suitable for use in corrosive atmospheres and low temperature environments.

Product Data SheetIP107, Rev BBSeptember 2012

3

Mobrey Vertical Level Switches

FEATURES

• Relevant chambers are supplied CE marked and fully compliant withthe Pressure Equipment Directive (97/23/EC)

• Unique switching mechanism – totally reliable

• No springs in switch mechanism – positive snap action switching

• Vibration resistant – eliminates spurious trips

• Multi-switching models – cost effective control

• Genuine hermetically sealed switch option – totally safe and secure

• Extensive range of chambers – suitable for most applications

• Designed to ASME B31.3

• Weld procedures approved to EN ISO 15614-1 and ASME IX

• Welders approved to EN 287-1

• Material certification to EN 10204, 3.1

• Materials to ASTM and B.S. Standards

APPROVALS

• Underwriters Laboratories (UL) ApprovalExplosion-proof for Class I, Div 1, Groups B, C, and DClass II, Div 1, Groups E, F, and GGeneral Area, Weatherproof type NEMA 4

• Canadian Standards Association (CSA) ApprovalExplosion Proof for Class 1, Groups B, C, and DGeneral Area, Weatherproof to NEMA 4

• Flameproof ATEX II 1/2G, EExd IIC T6 (-50 °CTa 60 °C)

Intrinsically Safe UseFor intrinsically safe circuits, gold-plated switch contacts are recommended. Users are reminded that it is their responsibility to obtain the necessary system approval and licences for such circuits.

EN ISO 9001: 2000

Rosemount Measurement Ltd. has been assessed and approved by Lloyds Register Quality Assurance against BS EN 9001: 2000 for the design, development, assembly and re-calibration of precision instruments and systems for the measurement and indication of electrical signals, gas and liquid density, viscosity, pressure, level, flow and water/steam systems.

QUALITY ASSURANCE

With over 20 years worldwide experience in the major power, nuclear and petro-chemical industries, Rosemount Measurement Ltd. is able to accommodate testing, surveying and documentation requirements as specified at the time of order. Inspection by customers or nominated inspection agencies can be arranged.

Section through type H4switch mechanism

Hermetically sealed switch mechanism



4

Ordering Information Table 1. Direct Mount: Vertical Displacer-type Level Switch Ordering Information★The Standard offering represents the most common options. The starred options (★) should be selected for best delivery.

The Expanded offering is subject to additional delivery lead time

Product Description

D(1)(2) Direct mount: vertical displacer-type level switch (no chamber)

Mounting Flange Material

Standard Standard

C Carbon steel. ASTM A105 (For use +300 to –10 ºC) ★

S 316L stainless steel. ASTM A182: F316L (For use +300 to –50 ºC) ★

Function and Specification(3)Maximum Pressure at 20º C

S.G. Range OperatingTemperatureElements Trim Spring 4 Contact 8 Contact

Standard Standard

11D One switch narrow diff. 316 SST

316SST

Nimonic90

0.6 to 1.2 0.75 to 1.2 –50 to +300ºC

102bar

★

12D One switch wide diff. 316 SST 0.5 to 1.2 0.75 to 1.2 –50 to +300ºC ★

13D Two switch 2 wide diff. 316 SST 0.6 to 1.2 0.8 to 1.2 –50 to +300ºC ★

18D Two switch 2 normal diff. 316 SST 0.6 to 1.2 0.8 to 1.2 –50 to +300ºC ★

Switch Enclosure(4)Maximum Number

of Switch MechanismsDuty Base Cover

Wetted Parts

Standard Standard

S4N Weatherproof IP66 Aluminium alloy (5) Drawn steel316SST

2

★

S7AFlameproof and explosion-proof

Aluminium alloy (5) Aluminium alloy ★

S7I Cast iron Cast iron ★

Approvals

Standard Standard

U UL Explosion-proof ★

C CSA Explosion-proof ★

N UL and CSA General Area, weatherproof type NEMA 4X ★

ATEX Flameproof and weatherproof IP66 depending on switch enclosure (leave the code blank e.g. D****S7A 1) ★

Number of Switch Mechanisms

Standard Standard

1 Specify 1 for single-switch models 11D and 12D ★

2 Specify 2 for two-switch models 13D and 18D ★

Switch Mechanism Type and Duty(6)

Max. Wetside A.C. Maximum Values D.C. Maximum Values

Temperature Volt Amps VA Volts Res. I Ind. I Watts

Standard Standard

4 Contact: 2 × SPST ★

D4 General purpose 300 ºC 440 5 2000 250 5 0.5 50 ★

D4U D4 + UL/CSA approved 300 ºC 400 5 2000 250 5 0.5 50 ★

P4 Low power circuits 300 ºC 250 0.25 6 250 0.25 0.1 3.6 ★

X4 High power circuits 250 ºC 440 10 2000 250 10 0.5 50 ★

H4 Hermetically sealed 250 ºC 440 5 2000 250 5 0.5 50 ★

8 Contact: DPDT







5


Mounting Arrangement

0 1-in. NPT thread, 316 SST ★

60 ASME B16.5 3-in. Class 150 RF flange

These are our stockedflanges. Other flange sizes and ratings are available on

request.

★

61 ASME B16.5 3-in. Class 300 RF flange ★





Typical Model Number: D C 13D S 7A U 2 D4 / 60

(1) See “Direct mount displacer controls” on page 15 for information about how the displacer-type level switches (**D) operate.(2) Supplied with 3 m of 316 stainless steel displacer cable as standard. Other lengths are available on request.(3) The switching-point is adjusted by moving the displacer elements on the cable. See “Direct mount displacer controls” on page 15 for information about this.(4) See “Mobrey Switch Enclosures” on page 14 for information about these options.(5) Base material will be cast iron whenever 8-contact switches are specified.

Customers must state operating pressure, temperature and specific gravity, together with function of each switch mechanism when ordering. Due to component tolerances, dimensions DB, E and S given on page 17 are approximate and may vary on each level switch by up to 10 mm. Setting the level switch to operate at the required level can be achieved on site by adjusting the element up or down on the cable as necessary.

(6) See “Mobrey Switch Mechanisms and Ratings” on page 13 for information about these options.

Table 1. Direct Mount: Vertical Displacer-type Level Switch Ordering Information★The Standard offering represents the most common options. The starred options (★) should be selected for best delivery.

The Expanded offering is subject to additional delivery lead time

Medium pressuresASME Class 150, 300 600SG 0.4

High pressuresASME Class 900, 1500, 2500SG 0.40

Direct mountingASME Class 150, 300, 600SG 0.4



6

Table 2. Direct Mount: Vertical Float-type Level Switch Ordering Information★The Standard offering represents the most common options. The starred options (★) should be selected for best delivery.

The Expanded offering is subject to additional delivery lead time.

Product Description

D Direct mount: vertical float-type level switch (no chamber)

Mounting flange material

Standard Standard

C Carbon steel ASTM A105 (for use +400 to –10 °C) ★

S 316L stainless steel ASTM A182: F316L (for use +400 to –101 °C) ★

Function and Specification(1)

MatchingMounting Flanges

Pressure Rating (Bar) FloatDiameter

(mm)Matching

Enclosures20°C 250°C 400°C

Standard Standard

11F Float Switch, minimum SG 0.80 34.5 22.5 20.2 67

All

3-in. NB or larger

★

12F Float Switch, minimum SG 0.75 102.1 66.5 59.2 90 ★

13F Float Switch, minimum SG 0.65 51.1 33.2 29.6 88 4-in. NB minimum

★

14F Float Switch, minimum SG 0.54 19.6 12.7 11.3 88 ★

Switch Enclosure(2)

Duty Base CoverWettedParts

Switch Adjust.

Max. No. of Switches

4 Contact 8 Contact

Standard Standard

R4NWeatherproof

IP66Aluminium alloy(3) Drawn steel

316SST

None 1 1 ★

S4N 94 mm 4 2 ★

L4N 194 mm 6 3 ★

R7A

Flameproof and Explosion-proof

Aluminium alloy(1) Aluminium alloyNone 1 1 ★

S7A 94 mm 4 2 ★

R7ICast iron Cast iron

None 1 1 ★

S7I 94 mm 4 2 ★

Approvals

Standard Standard



N UL and CSA General Area, weatherproof type NEMA 4 ★

ATEX Flameproof and weatherproof IP66 depending on switch enclosure (leave code blank e.g. D****R7A 1) ★


Standard Standard

1 to 6 As required, and subject to the maximum number of switches allowed for the selected switch enclosure (see above) ★


Max.Wetside

Temperature

AC max values DC max values

Volts Amps VA Volts Res. I Ind. I Watts

Standard Standard

4 contact: 2 x SPST

D4 General purpose 400 °C 440 5 2000 250 5 0.5 50 ★

D4U D4 + UL/CSA approved 400 °C 440 5 2000 250 5 0.5 50 ★

P4 Low power circuits 400 °C 250 0.25 6 250 0.25 0.1 3.6 ★

X4 High power circuits 250 °C 440 10 2000 250 10 0.5 50 ★

H4 Hermetically sealed 250 °C 440 5 2000 250 5 0.5 50 ★

8 contact: DPDT

D8 8 contact: DPDT 400 °C 440 5 2000 250 5 0.5 50 ★

D8U D8 + UL/CSA approved 400 °C 440 10 2000 250 5 0.5 50 ★

P8 Low power circuits 400 °C 250 0.25 6 250 0.25 0.1 3.6 ★


7


X8 High power circuits 250 °C 440 10 2000 250 10 0.5 50 ★

H8 Hermetically sealed 250 °C 440 5 2000 250 5 0.5 50 ★

Mounting Arrangement


60 ASME B16.5 3-in. Class 150 RF flange

These are our stocked flanges. Other flange sizes and ratings are available on request

★






Typical ordering information: D C 12F L4N U 4 D4 / 67

(1) See “Direct mount Float Type” on page 16 for information on how the float-type level switches (**F) operate.(2) See “Mobrey Switch Enclosures” on page 14 for further information about these enclosure options.(3) Base material will be cast iron whenever 8-contact switches are specified.

Customers must state operating pressure, temperature and specific gravity, together with function of each switch mechanism when ordering. Due to component tolerances, dimensions DB, E and S given on page 18 are approximate and may vary on each level switch by up to 10 mm. Setting the level switch to operate at the required level can be achieved on site by adjusting the element up or down on the cable as necessary.

(4) See “Mobrey Switch Mechanisms and Ratings” on page 13 for information about these options.

Table 2. Direct Mount: Vertical Float-type Level Switch Ordering Information★The Standard offering represents the most common options. The starred options (★) should be selected for best delivery.


Medium pressuresASME Class 150, 300 600SG 0.4

High pressuresASME Class 900, 1500, 2500SG 0.40

Direct mountingASME Class 150, 300, 600SG 0.4



8

Table 3. Carbon Steel Chamber with Mounted Float-type Level Switch Ordering Information★The Standard offering represents the most common options. The starred options (★) should be selected for best delivery.


Product Description – see “Chambers” on page 16

Standard Standard

B Bottle style chamber (including a float-type level switch sealed inside during manufacture) ★

X Flanged style chamber (including a float-type level switch; removable from chamber for routine maintenance) ★

Chamber Material

Standard Standard

C Carbon steel ★

Function and Specification(1)(2)

Float and Trim

MinimumSG

Flanged Style Chambers (X)

Pressure Rating (bar)

Flanged Process Connection

Pressure Rating (bar)

Threaded/Socket Process Connection

Pressure Rating (bar)Chamber

BodySize20 ºC 250 ºC 400 ºC 20 ºC 250 ºC 400 ºC 20 ºC 250 ºC 400 ºC

Standard Standard

11F

316SST

0.80 34.5 22.5 20.0 30.1 22.5 20.0 30.1 22.5 20.0 3-in. N.B. ★

12F 0.75 102.1 66.3 59.2 88.8 66.3 59.2 88.8 66.3 59.2

4-in. N.B.

★

13F 0.65 51.1 33.2 29.6 44.6 33.2 29.6 44.6 33.2 29.6 ★

14F 0.54 19.6 12.1 6.5 17.1 12.7 6.5 17.1 12.7 6.5 ★

17D 0.40 102.1 66.3 59.2 88.8 66.3 59.2 88.8 66.3 59.2 ★

Switch Enclosure(3)

Switch Adjust.


Base Cover Wetted Parts 4 Contact 8 Contact

Standard Standard

R4NWeatherproof IP66

Aluminiumalloy(4) Drawn steel

316 SST

None 1 1 ★

S4N 94 mm 4 2 ★

R7A

Flameproof andexplosion-proof

Aluminiumalloy(4)

Aluminiumalloy

None 1 1 ★

S7A 94 mm 4 2 ★


None 1 1 ★

S7I 94 mm 4 2 ★

Approvals

Standard Standard

U UL Explosion Proof ★

C CSA Explosion Proof ★


ATEX Flameproof and weatherproof IP66 depending on switch enclosure (leave blank e.g. R4N 1) ★


Standard Standard

1 to 6 As required, and subject to the maximum number of switches allowed for the selected switch enclosure (see above) ★

Type of Switch Mechanism(5)

Max. Wetside Temperature

A.C. max. values D.C. max. values

Volts Amps VA Volts Res. I Ind. I Watts

Standard Standard

4 contact: 2 x SPST






8 Contact: DPDT





9




Process Connection Configuration(6)

Standard Standard

1 Side/bottom ★

2 Side/side with 1-in. NPT drain ★

Process Connection Size and Rating(7)

Standard Standard

Chamber: 3-in. and 4-in. N.B.


11 1-in. Class 150 RF flange ★

12 1-in. Class 300 RF ★

13 1-in. Class 600 RF ★

15 DN25 PN16 ★

16 DN25 PN25 ★

17 DN25 PN40 ★

18 DN25 PN64 ★

19 DN25 PN100 ★

Chamber: 4-in. N.B.only

21 1½-in. ASME B16.5 Class 150 RF flange ★



25 DN40 PN16 ★

31 2-in. ASME B16.5 Class 150 RF flange ★



35 DN50 PN16 ★

36 DN50 PN25 ★

37 DN50 PN40 ★

Typical ordering information X C 14F S7A 2 D4 / 2 01

(1) See “Direct mount Float Type” on page 16 for information on how the float-type level switches (**F) operate.(2) See “Direct mount displacer controls” on page 15 for information how the displacer-type level switches (**D) operate.(3) See “Mobrey Switch Enclosures” on page 14 for further information about these enclosure options.(4) The base material is cast iron whenever 8-contact switches are specified.(5) See “Mobrey Switch Mechanisms and Ratings” on page 13 for information about these switch mechanism options.(6) Customers must state process connection centres when ordering. See “Dimensional Drawings” on page 17.(7) Other flange sizes and ratings are available on request. The instrument pressure rating is the lower of either the float or process flange.

Table 3. Carbon Steel Chamber with Mounted Float-type Level Switch Ordering Information★The Standard offering represents the most common options. The starred options (★) should be selected for best delivery.


Medium pressuresASME Class 150, 300 600

High pressuresASME Class 900, 1500, 2500

Direct mountingASME Class 150, 300, 600



10

Table 4. Stainless Steel Chamber with Mounted Float-type Level Switch Ordering Information★The Standard offering represents the most common options. The starred options (★) should be selected for best delivery.


Product Description – see “Chambers” on page 16

B Bottle style chamber (including a float-type level switch sealed inside during manufacture)

X Flanged style chamber (including a float-type level switch; removable from chamber for routine maintenance)

Chamber Material

Standard Standard

S 316L stainless steel ★

Function and Specification(1)(2)

Float and Trim

MinimumSG

Flanged Style Chambers (X)

Pressure Rating (Bar)

Flanged Process Connection

Pressure Rating (Bar)

Threaded/Socket Process Connection

Pressure Rating (Bar) Chamber

BodySize20 ºC 250 ºC 400 ºC 20 ºC 250 ºC 400 ºC 20 ºC 250 ºC 400 ºC

Standard Standard

12F

316SST

0.75 82.7 54.9 48.6 82.7 54.9 48.6 88.8 66.3 59.2

4-in. N.B.

★

13F 0.65 41.4 27.5 24.3 41.4 27.5 24.3 44.6 33.2 29.6 ★

14F 0.54 15.9 10.5 6.5 15.9 10.5 6.5 17.1 12.7 11.3 ★

17D 0.40 82.7 54.9 48.6 82.7 54.9 48.6 88.8 66.3 59.2 ★

Switch Enclosure(3)

Base CoverWetted Parts

Switch Adjust.


Standard Standard

R4NWeatherproof IP66

Aluminiumalloy(4) Drawn steel

316 SST

None 1 1 ★

S4N 94 mm 4 2 ★

R7A

Flameproof and explosion-proof

Aluminiumalloy(4) Aluminium alloy

None 1 1 ★

S7A 94 mm 4 2 ★


None 1 1 ★

S7I 94 mm 4 2 ★

Approvals

Standard Standard




ATEX Flameproof and weatherproof IP66 depending on switch enclosure (leave the code blank e.g. R4N 1) ★


Standard Standard

1 - 4 As required, and subject to the maximum number of switches allowed for the selected switch enclosure (see above) ★


Max. WetsideTemperature

A.C. Maximum Value D.C. Maximum Values

Volt Amps VA Volts Res. I Ind. I Watts

Standard Standard

4 Contact: 2 × SPST






8 Contact: DPDT





11




Process Connection Configuration(6)

Standard Standard

1 Side/bottom ★

2 Side/side with 1-in. NPT drain ★

Process Connection Size and Rating(7)

Standard Standard

01 1-in. NPT 316 stainless steel standard ★










Typical ordering information: B S 17D R4N U 1 X8 / 2 33

(1) See “Direct mount Float Type” on page 16 for information on how float-type level switches (**F) operates.(2) See “Direct mount displacer controls” on page 15 for information about how displacer-type level switches (**D) operates.(3) See “Mobrey Switch Enclosures” on page 14 for further information about these enclosure options.(4) The base material is cast iron whenever 8-contact switches are specified.(5) See “Mobrey Switch Mechanisms and Ratings” on page 13 for information about these switch mechanism options.(6) Customers must state process connection centres when ordering. See page X for dimension drawings.(7) Other flange sizes and ratings are available on request. The instrument pressure rating is the lower of either the float or process flange.

Table 4. Stainless Steel Chamber with Mounted Float-type Level Switch Ordering Information★The Standard offering represents the most common options. The starred options (★) should be selected for best delivery.


Medium pressuresASME Class 150, 300 600 High pressures

ASME Class 900, 1500, 2500 Direct mountingASME Class 150, 300, 600



12

Technical Specifications

QUALITY STANDARDS

Mobrey vertical level controls are manufactured to the highest standards of quality with only certified materials: BS EN 10204: 2004-3.1. Design of Mobrey chambers is in accordance with ASME B31.3. Relevant chambers are supplied CE marked and fully compliant with the Pressure Equipment Directive (97/23/EC).

Weld procedures approved to EN ISO 15614-1 and ASME IX, welders approved to BSEN 287-1. Circumferential and set-on branch welds are full penetration welds, with visual inspection in accordance with ASME B31.3 “normal service” requirements and our company standard 417.

All pressure retaining assemblies are hydrostatically pressure tested to a minimum of 1.43 × maximum working pressure or to flange standard requirements.

Radiography or other NDT techniques can be accommodated provided that they are specified at time of order entry.

Inspection

Whilst Rosemount Measurement employ inspectors in house, unconnected with production, customers frequently ask for outside inspection. We are happy to accommodate nominated inspectors if agreed at order entry.

Some specifications require a quality control plan detailing inspection points and hold points. Rosemount Measurement will produce these QC plans for customer approval if agreed at order entry.

Table 5. Pressure Ratings (bar)

Table 6. Construction Materials

Material Carbon steel: A105 Stainless steel: 316L

20 ºC 250 ºC 400 ºC 20 ºC 250 ºC 400 ºC

ASME B16.5 Class 150 19.6 12.1 6.5 15.9 10.5 6.5

ASME B16.5 Class 300 51.1 41.9 34.7 41.4 27.5 24.3

ASME B16.5 Class 600 102.1 83.9 69.4 82.7 54.9 48.6

EN1092-1 PN16 16 14.4 10.8 12.3 7.9 6.8

EN1092-1 PN25 25 22.5 16.9 19.2 12.4 10.7

EN1092-1 PN40 40 36 27 30.6 19.8 17.1

Carbon steel chamber Stainless steel chamber

Chamber tube ASTM A106 grade B ASTM A312 TP316L

Top casting ASTM A216 -

Top/bottom caps ASTM A105 ASTM A182 F316L / A403 WP316L

Top cover ASTM A105 ASTM A182 F316L

Flanges/fittings ASTM A105 ASTM A182 F316

Studs ASTM A193-B7 ASTM A320-L7

Nuts ASTM A194-2H ASTM A194 Grade 7+S3

Standard carbon steel chambers +400ºC to -10ºC. Stainless steel chambers +400°C to -101°C

Options

• Low temperature carbon steel • Ratings up to ASME Class 2500 • N.A.C.E. requirements

• Process connections to specification • Cr. mo. steels • N.D.T. to your specifications

• Duplex UNS31803 • 3.1 identifiable certification • Vent and drain connections

Pressure tube & union.Swanged & welded construction

Magnet sheathed in316 st. steel

‘0’ ring seal to base

Fullpenetrationwelding

Weld neckflanges usedthroughout

Float


13


MOBREY SWITCH MECHANISMS AND RATINGS

Each switch mechanism has flying leads which are factory wired to ceramic terminal blocks fixed in the switch enclosure.

Table 7. Mobrey Switch Mechanisms

Table 8. Electrical Ratings for Mobrey Switch Mechanisms

Gold plating on the contacts of P4 and P8 switch mechanisms may be permanently damaged if the mechanisms are used to switch circuits with values greater than those shown above.

Switches must not be used for the direct starting of motors.

Contacts should be wired in series with the operating coils of relays, contactor starters or solenoid valves and fused separately.

Mobrey Switch Mechanisms

4 contact type: D4, X4, P4, H4

2 × independent SPSTAA make on rise: BB Make on fall

Type D4, D8:

Type D4U, D8U:

Type X4, X8:

Type P4, P8:

Type H4, H8:

General purpose switch mechanism.

General purpose switch mechanism with UL and CSA approvals.

High current switch mechanism.

Switch mechanism with gold plated contacts for use in low power or intrinsically safe circuits.

Hermetically sealed mechanism with gold plated contacts. All moving parts and contacts enclosed is an inert gas filled stainless steel enclosure. Suitable for use in low temperatures, contaminated atmospheres and intrinsically safe circuits.

8 contact types: D8, X8, P8, H8

Double pole double throw (1)

(4 × independent SPST)AA make on rise, BB make on fall

(1) For DPDT operation, installer must common any one pair of A and B wires in the terminal block for each of the two sets.

Electrical Ratings

Type

Maximum TemperatureWetside ºC

Low Temperature

Use

AC Maximum Values DC Maximum Values

VA Volts Amps Watts VoltsResidual

AmpsInductive

Amps

D4, D8 400 No 2000 440 5 50 250 5 0.5

D4U, D8U 400 No 2000 440 5 50 250 5 0.5

X4, X8 250 No 2000 440 10 50 250 10 0.5

P4, P8 400 No 6 250 0.25 3.6 250 0.25 0.1

H4, H8 250 -50 ºC 2000 440 5 50 250 5 0.5



14

MOBREY SWITCH ENCLOSURES

Table 9. Mobrey Switch Enclosures

Mobrey Switch Enclosures

Enclosure modulesR4N, S4N, L4N

Weatherproof industrial enclosure

Weatherproof NEMA 4 / IP66.Aluminium alloy based/drawn steel cover.Type R4N: Fixed switchType S4N: 94 mm switch adjustmentType L4N: 194 mm switch adjustment

Flameproof and explosion-proof (weatherproof NEMA 4 / IP66)Aluminium alloy base and cover “A”Cast iron base and cover “I”

Type R7A/R7I: Fixed switchType S7A/S7I: 94mm switch adjustment

Conduit entriesEnclosures supplied with four contact switch mechanisms have a single 1-in. NPT conduit entry.Enclosures supplied with eight contact switch mechanisms have 2 × 1-in. NPT conduit entries.

Tube and unions:316 stainless steel throughout. Welded construction with additional swaging technique to ensure maximum integrity. Individually pressure tested to 150 bar (operating pressure will be limited by float or flange specified).

Paint finish:Black stove paint. Epoxy paint finishes available on request.

Enclosure modulesR7A, R7I, S7A, S7I

Hazardous area enclosure


15


DIRECT MOUNT DISPLACER CONTROLS

Mobrey displacer operated controls are ideal for sump application and other top mounting duties such as low level alarm in deep tanks. Their principle of operation also makes them suitable, in a modified form, for very high pressure or low S.G. applications.

The four most popular displacer arrangements are shown in this schematic diagram, which covers most of the likely applications. However, should you have a different requirement, we would be pleased to quote a model for your particular application.

Principle of operation

The displacer element, made of 316 stainless steel, is suspended on a stainless steel cable from a spring. The element is always heavier than its equivalent volume of the liquid in which it is to operate, and so will extend the tension spring at all times. In free air, the spring will be extended to a known length, controlled by a mechanical stop to prevent overstressing. Fixed to the spring is the float rod and magnet assembly, free to move up and down as the spring extends or contracts, and outside the pressure tube in the usual manner is the switch mechanism.

As liquid rises to cover the displacer element, a buoyancy force is created equal to the weight of the liquid displaced. This force in effect is seen by the spring as a reduction in weight, causing the spring to contract, hence moving the magnet upwards inside the pressure tube and actuating the switch mechanism. On a falling liquid level, the displacer element is uncovered and the spring sees an increasing effective weight, causing the spring to extend and move the magnet to re-set the switch mechanism (Fig i and v).

This simple principle can be refined to operate a single switch over a very wide differential by providing the buoyancy force from two elements instead of just one (Fig ii).

Two switch models are available for either two alarm duty with two narrow differentials (Fig iii) or for pump control/alarm duty with appropriate differentials (Fig iv).

In all cases, because the elements are suspended on a cable, switching or control levels can be several metres below the mounting flange, and are fully field adjustable by re-setting the elements on the cable.

One switch alarm differential

Differential

Figure i

One switch pump control

Differential

Figure ii

Two switch two alarm

Differential No. 1

Figure iii

Differential No. 2

Two switch alarm and pump control

Figure iv

Alarm or pump differential

Pump differential

Figure vDisplacer Control



16

DIRECT MOUNT FLOAT TYPE

The float carries a stainless steel sheathed permanent magnet which rises and falls in the glandless pressure tube with changing liquid level.A switch mechanism is mounted inside the enclosure adjacent to the pressure tube. Switching is achieved with the unique Mobrey ‘three-magnet’ system, giving snap-action ‘latch-on’ switching.

Vertical movement of the float magnet in the pressure tube simultaneously actuates the secondary and tertiary magnets in the switch mechanism to operate the contacts. This ‘three magnet’ system enables the float magnet to pass on and actuate switch mechanisms at other levels. Switch mechanisms already actuated cannot re-set until the return of the primary magnet actuates the magnet system once again.

CHAMBERS

Table 10. Chamber Types and Construction Materials

Table 11. Process Connection Configuration

Switch magnet

Secondary magnet

Float magnet

Carbon steel: Bottle construction BC Carbon steel: Flanged construction XC

Float is sealed inside chamber during manufacture Float may be removed from chamber for routinemaintenance, cleaning or inspection

Side and Bottom - 1 Side and Side with Drain - 2

Chamber dimensions, operating levels and technical data are given on page 19


17


Dimensional Drawings

DISPLACER TYPES AND DIMENSIONAL DETAILS

Table 12. Displacer Types and Dimensional Details

Displacer Types and Dimensional Details

Single switch narrow differential: 11DSpecify for alarm duty.Switching level can be changed by simply moving the displacer up or down the cable.11D St. Steel: A = 216 Ø = 60.3

Switch type D4/D4U P4 X4 H4 D8/D8U P8 X8 H8

S.G. 0.6 0.75 1.0 1.2 0.75 1.0 1.2

S minimum 315 335 365 380 275 320 340

E 90 70 60 55 135 105 90

S min. = Adjustable distance to upper switching level.E min. = DifferentialDB = Minimum dead band

Single switch wide differential: 12D

The two displacer elements are positioned at any point on the cable to correspond to the switching levels required. When the liquid level drops to the lower displacer the switch is actuated and starts (or stops) a pump; when the liquid rises to the upper displacer the switch is again actuated to stop (or start) the pump.

12D St. Steel: A = 216 Ø = 60.3


S.G. 0.5 0.8 1.0 1.2 0.75 0.8 1.0 1.2

S min. 415 430 430 425 390 390 400 400

E 165 110 95 80 205 200 165 140

Two switch 2 narrow differentials: 18DThe displacers are positioned to form two elements of similar lengths, such that two alarm points may be given. This arrangement is typical of sump application.18D St. Steel: A = 216 Ø = 60.3


S.G. 0.6 0.8 1.0 1.2 0.8 1.0 1.2

S min. 390 385 375 365 355 350 345

E min. 90 70 60 55 135 105 90

Dead band 200 230 255 310 165 215 250

Two switch 2 wide differentials: 13D

A pump is controlled between the middle and the lower pump displacers positioned on the cable at the required levels. Should the level rise to the upper displacer this actuates the upper alarm switch which remains actuated until the level drops to the middle displacer. Alternatively, the upper switch could control a second pump.

13D St. Steel: A = 152 B = 304 Ø = 60.3


S.G. 0.6 0.8 1.0 1.2 0.8 1.0 1.2

S min. 390 385 375 365 355 350 345

E min. 135 110 95 80 200 145 140

Dead band 220 255 285 310 165 215 250

S

EA

Ø

A

A

S

E

Ø

S

E

E

A

A

Ø

DB

S

E

E

A

B

A

Ø

DB



18

DIRECT MOUNTING FLOAT TYPE DIMENSIONS

Table 13. Direct Mounting Float Type Dimensions

Float Types for 3-in. NB Mounting: 11F Floats Types for 4-in. NB Mounting: 12F, 13F, 14F

*Float rod may be shortened to suit *Float rod may be shortened to suit

H dimensionwhen used with

11FSwitch

adjustmentWet switching

differential

12F 13F 14FSwitch

adjustmentWet switching

differentialmin. H max H min. H max H

R4N R7A R7I 155 315 None 20 mm 155 415 None 20 mm

S4N S7A S7I 155 315 94 mm 104 mm max. 155 415 94 mm 104 mm max.

S7A S7I L4N 155 415 194 mm 214 mm max.

H*

150Ø67

H+35 H+35

Ø88Ø90

H*

160


19


CHAMBERS WITH VERTICAL LEVEL SWITCHES FITTED

Table 14. Chamber Dimensional and Operating Level Data

Style 1: Side and Bottom Style 2: Side and Side

Process connections

A B* (1) C (2)(3) D (3) E F

Singleswitch

‘R’ headMulti-type‘S’ head

Chambertype

BC/others

Singleswitch

‘R’ head (4)

Multiswitch

‘S’ head (5)

Singleswitch

‘R’ head

Multiswitch

‘S’ head

Chamber type

BC/BS XC/XS

1-in. NPT (side/bottom) 300 385 76/95 50 70 155 – – 48/160 225

1-in. NPT (side/side) – – 95 50 70 155 271 356 160 225

1-in. 150 356 441 110 50 70 155 271 356 160 225

1-in. 300 356 441 117 50 70 155 271 356 160 225

1-in. 600 356 441 123 50 70 155 271 356 160 225

DN25 PN16 356 441 94 50 70 155 271 356 160 225

DN25 PN25 356 441 96 50 70 155 271 356 160 225

DN25 PN40 356 441 96 50 70 155 271 356 160 225

DN25 PN64 356 441 114 50 70 155 271 356 160 225

DN25 PN100 356 441 114 50 70 155 271 356 160 225

1½-in. 150 356 441 115 50 70 155 271 356 160 225

1½-in. 300 356 441 121 50 70 155 271 356 160 225

1½-in. 600 356 441 126 50 70 155 271 356 160 225

DN40 PN16 356 441 97 50 70 155 271 356 160 225

2-in. 150 356 441 112 50 70 155 271 356 160 225

2-in. 300 356 441 118 50 70 155 271 356 160 225

2-in. 600 356 441 129 50 70 155 271 356 160 225

DN50 PN16 356 441 98 50 70 155 271 356 160 225

DN50 PN25 356 441 101 50 70 155 271 356 160 225

Operating levels: Type 17D float in any chamber

Operating S.G. 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2

Dimension C 65 73 82 91 100 109 118 127 136

Dimension D 118 122 127 132 137 141 147 152 156

Note: All dimensions in mm.

G G

F

A

B

F

A

C

D

G

F

E

160

BDrain

1-in. NPTDrain

1-in. NPT B

160

G

F

E



20

(1) B* Dimension given is for 4-in.NB chamber (12F, 13F, 14F, and 17D floats). For 3-in. NB chamber (11F float), subtract 13 mm.(2) C = Highest operating liquid level(3) D-C = Wet switching differential (max)(4) D (Single switch) = Reset level(5) D (Multi switch) = Lowest operating liquid level

NOTE: Dimensions given are for reference only, and must be certified on order.

Dimensional data: enclosures

Type Duty Height G Conduit thread (1) Switch adjustment Weatherproof rating

R7A, R7I Flameproof andExplosion-proof

1901-in. NPT

None IP66 to IEC60529(NEMA 4)S7A, S7I 300 94

R4N

Weatherproof

170

1-in. NPT

NoneIP66 to IEC60529

(NEMA 4)S4N 275 94

L4N 375 194

(1) Enclosures for use with 8 contact switch mechanisms have both conduit entries threaded, whilst those for use with 4 contact switch mechanisms have only one conduit entry.


21




22


23




IP107 9/12

International:Emerson Process Management Rosemount Measurement Ltd. 158 Edinburgh AvenueSlough, Berks, SL1 4UE, UK T +44 (0)1753 756600F +44 (0)1753 823589www.emersonprocess.com

Americas:Emerson Process Management Rosemount Inc.8200 Market Boulevard Chanhassen, MN 55317, USATel (USA) 1 800 999 9307Tel (International) +1 952 906 8888 Fax +1 952 906 8889

POINT LEVEL DETECTION

Vibrating Fork Liquid Level Switches

For high and low alarms, overfill protection, pump control, including wide pressure and temperature requirements, and hygienic applications. Flexible mounting. Immune to changing process conditions and suitable for most liquids.

• Mobrey Mini-Squing (Compact)

• Mobrey Squing 2 (Full-featured)

Ultrasonic Gap Sensor Liquid Level Switches

For use in non-hazardous industrial processes to detect high or low liquid levels and liquid interface. Immune to changing density, and wide dielectric and pH variations. Suitable for use in most clean and non-aerated liquids, with options for sludges and slurries.

Float and Displacer Liquid Level Switches

Mobrey electromechanical float and displacer level switches are ideal for alarm and pump control duties, especially in critical applications or hazardous areas.

• Mobrey Horizontal Level Switches

• Mobrey Vertical Level Switches

Chambers are available for external mounting of these level switches on process vessels.

Dry Products Level Switches

For high and low level alarms. Including threaded mounting connections, extended lengths, high temperature capability, and multiple detection techniques. Suitable for a wide variety of powders, granules, and free flowing solids with wide variations in bulk densities.

• Mobrey VLS Series – Vibrating Rod Level Switch

• Mobrey PLS Series – Paddle Level Switch

CONTINUOUS MEASUREMENT

Ultrasonic Continuous Level Transmitters and Controllers

Top mounted, non-contacting for simple tank and open-air process level measurements. Unaffected by fluid properties such as density, viscosity, dirty coating, and corrosiveness. Intrinsically Safe versions are available for operating in hazardous areas.

• Mobrey MSP Series Ultrasonic Level and Flow Transmitters

• Mobrey MCU900 Series Universal Controllers

Ultrasonic Sludge Density Blanket Monitoring and Control

Ultrasonic in-line pipe or tank mounted sensors for sludge density measurement and control in Industrial and Municipal effluent treatment processes.

• Mobrey MSM400 – Sludge Density Monitor

Displacer Continuous Level Measurement

Top mounted in a vessel or externally mounted in a vertical chamber. For use in hazardous areas.

• Mobrey MLT100 – Displacer Level Transmitter

Hydrostatic Continuous Level Transmitter

For level measurements in non-pressurized tanks where in-tank problems such as foaming, vapor layers, and temperature gradients prohibit the use of other instrumentation.

• Mobrey 9700 Series hydrostatic electronic level transmitters

SPECIALIZED CONDUCTIVITY

Conductivity Water and Steam Interface Monitoring

Steam/water interface level gauges using specialized, high performance conductivity probes in external columns and manifolds, ideal for steam plants where reliable and redundant indication of boiler water level and turbine protection is critical.

• Hydratect 2462 – Water/Steam detection Systems

• Hydrastep 2468 – Water/Steam Monitoring Systems

©2012 Rosemount Measurement Ltd. All rights reserved.

The Emerson logo is a trademark and service mark of Emerson Electric Co.Rosemount is a registered trademark of Rosemount Inc.Mobrey is a registered trademark of Rosemount Measurement Ltd.All other marks are the property of their respective owners.Standard Terms and Conditions of Sale can be found at www.rosemount.com\terms_of_sale

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